Linux kernel: disable SHANI-512 asm code

Signed-off-by: Stephan Mueller <smueller@chronox.de>

Author: smuellerDD

hash/src/asm/AVX2/sha2-512-AVX2.S

@@ -1764,6 +1764,7 @@ SYM_FUNC_END(sha512_block_data_order)
 
 #endif
 
+#ifndef CONFIG_LEANCRYPTO_SHA2_512_DISABLE_SHANI
 SYM_FUNC_START(sha512_block_data_order_shaext)
 SYM_FUNC_ENTER(sha512_block_data_order_shaext)
 .align	64
@@ -1993,6 +1994,7 @@ SYM_FUNC_ENTER(sha512_block_data_order_shaext)
 	RET
 .cfi_endproc
 SYM_FUNC_END(sha512_block_data_order_shaext)
+#endif
 
 #if 0
 SYM_FUNC_START(sha512_block_data_order_xop)

linux_kernel/Kbuild.sha2

@@ -78,8 +78,10 @@ leancrypto-$(CONFIG_LEANCRYPTO_SHA2_512)				       \
 
 # Disable this support, because objtool cannot handle SHANI-512 instructions
 # in kernels < 6.10. If you have a newer kernel, you can enable it without
-# an issue. To reenable it, turn shani_null into shani below.
+# an issue. To reenable it, turn shani_null into shani below and remove the
+# define.
 ifdef CONFIG_X86_64
+ccflags-y			+= -DCONFIG_LEANCRYPTO_SHA2_512_DISABLE_SHANI
 leancrypto-$(CONFIG_LEANCRYPTO_SHA2_512)				       \
 				+= ../hash/src/sha512_avx2.o		       \
 				   ../hash/src/sha512_shani_null.o	       \